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The Drillco Maxi Bolt combines the capacity and reliability of cast in place anchors with the convenience and ease of installation of expansion anchors. Utilizing a patented Drillco Undercutting Tool (Pat. #4,307,636) to form a conical undercut hole in concrete, the Maxi Bolt consistently develops the full capacity of it's ASTM A193 B7 bolting material without slippage. The Maxi Bolt is available in 1/4", 3/8", 1/2", 5/8", 3/4", 1", and 1 1/4" diameters providing factored design load capacities from 2.7 to 85 Kips. Stainless steel and A36 Maxi Bolts are also available on a special order basis.